Soak the chickpeas for 4 hours at room temperature and up to 24 hours in the fridge.
Drain the chickpeas.
Preheat the oven to 180 C / 360 F.
In a food processor add the onion, garlic, parsley, salt, coriander, cumin and chop.
Add the chickpeas and olive oil and blend until you have a smooth falafel mixture.
Grease the baking sheet with olive oil. We do this do the falafel can crisp up.
Using your hands scoop 2 tablespoons of mixture and shape into patties. Shape the falafel into small patties (they should be about 2 inches wide and ½ inch thick)
Place each falafel on your oiled baking sheet.
Bake for 30 minutes, flipping them gently after 20 minutes.